<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div.top{
            background-color: #718096;
            height: 160px;
        }
        div.left{
            height: 600px;
            background-color: #0a58ca;
            width: 200px;
            float: left;

        }
        div.right{
            height: 600px;
            background-color: orangered;
        }
        div.footer{
            height: 200px;
            background-color: #000;
            color:#fff;
            clear: both;
        }
    </style>
</head>
<body>
    <div class="top">
        我是导航
    </div>
<div class="left">Left</div>
<div class="right">right</div>
<div class="footer">Footer</div>
</body>
</html>
